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[[Image:HHBetrayal.jpg|thumb|right|The Horus Heresy Book One - Betrayal{{Fn|1}}]]

The '''Horus Heresy''', sometimes referred to as '''Warhammer 30,000''' or ''30k'', is a supplement and expansion game produced by [[Forge World (Company)|Forge World]] to [[Warhammer 40,000]]. Set roughly ten thousand years before the time of ''Warhammer 40,000'', the game system takes place during with the events of the tumultuous [[Horus Heresy]] and includes weapons and characters such as [[Primarch]]s which existed during that time.{{Fn|1}}